/*
 * Copyright (C) 2009 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package pen.gesture.input;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.MotionEvent;
import android.gesture.GestureOverlayView;
import android.gesture.Gesture;
import android.gesture.GestureLibrary;
import android.widget.TextView;
import android.widget.Toast;

public class CreateGestureActivity extends Activity {
	private static final float LENGTH_THRESHOLD = 120.0f;

	private Gesture mGesture;
	private View mDoneButton;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		
		setContentView(R.layout.create_gesture);

		mDoneButton = findViewById(R.id.done);

		GestureOverlayView overlay = (GestureOverlayView) findViewById(R.id.gestures_overlay);
		overlay.addOnGestureListener(new GesturesProcessor());
	}

	@Override
	protected void onSaveInstanceState(Bundle outState) {
		super.onSaveInstanceState(outState);
		
		if (mGesture != null) {
			outState.putParcelable("gesture", mGesture);
		}
	}

	@Override
	protected void onRestoreInstanceState(Bundle savedInstanceState) {
		super.onRestoreInstanceState(savedInstanceState);
		
		mGesture = savedInstanceState.getParcelable("gesture");
		if (mGesture != null) {
			final GestureOverlayView overlay =
				(GestureOverlayView) findViewById(R.id.gestures_overlay);
			overlay.post(new Runnable() {
				public void run() {
					overlay.setGesture(mGesture);
				}
			});

			mDoneButton.setEnabled(true);
		}
	}

	public void addGesture(View v) {
		if (mGesture != null) {
			final TextView input = (TextView) findViewById(R.id.gesture_name);
			final CharSequence name = input.getText();
			if (name.length() == 0) {
				input.setError(getString(R.string.error_missing_name));
				return;
			}
			
			final GestureLibrary store = GestureBuilderActivity.getStore();
			store.addGesture(name.toString(), mGesture);
			store.save();
			
			setResult(RESULT_OK);
			
			Toast.makeText(this, R.string.save_success, Toast.LENGTH_LONG).show();
		} else {
			setResult(RESULT_CANCELED);
		}
		
		finish();

	}

	public void cancelGesture(View v) {
		setResult(RESULT_CANCELED);
		finish();
	}
	
	private class GesturesProcessor implements GestureOverlayView.OnGestureListener {
		public void onGestureStarted(GestureOverlayView overlay, MotionEvent event) {
			mDoneButton.setEnabled(false);
			mGesture = null;
		}
	
		public void onGesture(GestureOverlayView overlay, MotionEvent event) {
		}
	
		public void onGestureEnded(GestureOverlayView overlay, MotionEvent event) {
			mGesture = overlay.getGesture();
			if (mGesture.getLength() < LENGTH_THRESHOLD) {
				overlay.clear(false);
			}
			mDoneButton.setEnabled(true);
		}
	
		public void onGestureCancelled(GestureOverlayView overlay, MotionEvent event) {
		}
	}
}
